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Advent calendar 2015
8 December
All 2015 advent puzzles
~
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What is the largest number of factors which a number less than a million has?
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720720 has 240 factors.
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Most recent collections
Advent calendar 2025
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List of all puzzles
Tags
complex numbers
fractions
coordinates
range
powers
percentages
games
decahedra
means
trigonometry
even numbers
balancing
folding tube maps
mean
arrows
remainders
books
quadratics
prime factors
multiplaction squares
pentagons
planes
consecutive numbers
symmetry
christmas
probability
routes
binary
2d shapes
partitions
spheres
graphs
neighbours
number
shape
sums
digital clocks
sport
people maths
polygons
division
sequences
time
perfect numbers
axes
median
multiples
crossnumbers
cryptic crossnumbers
averages
geometric means
bases
dominos
probabilty
regular shapes
medians
matrices
cards
menace
cryptic clues
products
quadrilaterals
unit fractions
coins
crosswords
cubics
factors
dodecagons
dice
speed
floors
the only crossnumber
ave
star numbers
digits
hexagons
functions
sum to infinity
algebra
scales
odd numbers
triangles
geometric mean
numbers
prime numbers
tangents
determinants
logic
xor
tournaments
albgebra
money
sets
indices
chess
gerrymandering
addition
circles
factorials
wordplay
integration
square grids
square numbers
triangle numbers
3d shapes
surds
lines
palindromes
perimeter
consecutive integers
expansions
rectangles
pascal's triangle
advent
differentiation
elections
cube numbers
proportion
combinatorics
chocolate
doubling
colouring
multiplication
polynomials
square roots
angles
taxicab geometry
squares
volume
grids
integers
irreducible numbers
rugby
area
ellipses
tiling
dates
clocks
chalkdust crossnumber
geometry
shapes
calculus
lists
parabolas
digital products
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